EP1979786B1 - Optically variable device mastering system, method of authenticating articles employing the same, and resultant article - Google Patents

Optically variable device mastering system, method of authenticating articles employing the same, and resultant article Download PDF

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Publication number
EP1979786B1
EP1979786B1 EP07756494A EP07756494A EP1979786B1 EP 1979786 B1 EP1979786 B1 EP 1979786B1 EP 07756494 A EP07756494 A EP 07756494A EP 07756494 A EP07756494 A EP 07756494A EP 1979786 B1 EP1979786 B1 EP 1979786B1
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EP
European Patent Office
Prior art keywords
optically variable
variable device
optical
diffractive
prepared substrate
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EP07756494A
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German (de)
English (en)
French (fr)
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EP1979786A4 (en
EP1979786A2 (en
Inventor
Nigel C. Abraham
Holger Hofmann
Raymond L. Keating
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3dcd LLC
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3dcd LLC
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Publication of EP1979786A4 publication Critical patent/EP1979786A4/en
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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
    • G03H1/0005—Adaptation of holography to specific applications
    • G03H1/0011—Adaptation of holography to specific applications for security or authentication
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
    • G03H1/04—Processes or apparatus for producing holograms
    • G03H1/08—Synthesising holograms, i.e. holograms synthesized from objects or objects from holograms
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
    • G03H1/04—Processes or apparatus for producing holograms
    • G03H1/08—Synthesising holograms, i.e. holograms synthesized from objects or objects from holograms
    • G03H1/0891—Processes or apparatus adapted to convert digital holographic data into a hologram
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/26—Apparatus or processes specially adapted for the manufacture of record carriers
    • G11B7/261—Preparing a master, e.g. exposing photoresist, electroforming
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
    • G03H1/02—Details of features involved during the holographic process; Replication of holograms without interference recording
    • G03H1/024—Hologram nature or properties
    • G03H1/0244—Surface relief holograms
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
    • G03H1/02—Details of features involved during the holographic process; Replication of holograms without interference recording
    • G03H1/0276—Replicating a master hologram without interference recording
    • G03H2001/0288—Replicating a master hologram without interference recording by electroforming
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
    • G03H1/02—Details of features involved during the holographic process; Replication of holograms without interference recording
    • G03H1/0276—Replicating a master hologram without interference recording
    • G03H2001/0296—Formation of the master hologram
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
    • G03H1/04—Processes or apparatus for producing holograms
    • G03H1/0476—Holographic printer
    • G03H2001/0478—Serial printer, i.e. point oriented processing
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
    • G03H1/26—Processes or apparatus specially adapted to produce multiple sub- holograms or to obtain images from them, e.g. multicolour technique
    • G03H2001/2605—Arrangement of the sub-holograms, e.g. partial overlapping
    • G03H2001/261—Arrangement of the sub-holograms, e.g. partial overlapping in optical contact
    • G03H2001/2615—Arrangement of the sub-holograms, e.g. partial overlapping in optical contact in physical contact, i.e. layered holograms
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H2224/00—Writing means other than actinic light wave
    • G03H2224/04—Particle beam, e.g. e-beam
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H2270/00—Substrate bearing the hologram
    • G03H2270/20—Shape
    • G03H2270/22—Disc shaped
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/00086—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy
    • G11B20/00572—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving measures which change the format of the recording medium
    • G11B20/00586—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving measures which change the format of the recording medium said format change concerning the physical format of the recording medium
    • G11B20/00608—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving measures which change the format of the recording medium said format change concerning the physical format of the recording medium wherein the material that the record carrier is made of is altered, e.g. adding reactive dyes that alter the optical properties of a disc after prolonged exposure to light or air
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24802—Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.]

Definitions

  • the invention relates generally to optically variable devices and, more particularly, to a system and method for mastering optically variable devices utilizing a laser beam recorder.
  • the invention further relates to the authentication of articles, such as, for example, optical discs, by employing such a system and method, and to resultant articles.
  • An optically variable device is a device which creates a change or shift in appearance, such as, for example and without limitation, a change in color or shape, when observed from different angles.
  • the evolution of the OVD stems largely from the search for a mechanism to resist counterfeiting of certain articles and products. Complexity of design, difficulty in creating the 'master' OVD, and difficulty in altering the original design have evolved to make OVDs a successful tool for authenticating the article or a product from a counterfeit or "pass off.”
  • optical disc such as, for example, compact discs (CDs) and digital versatile discs (DVDs), which are used to store data including, for example, computer software, video data such as movies, and music.
  • CDs compact discs
  • DVDs digital versatile discs
  • N.C. Abraham's U.S. Patent No. 5,452,282 discloses a method of integrating holographic elements into the same layer as the data that is recorded on the optical disc. See also, N.C. Abraham's U.S. Patent Nos. 5,533,002 and 6,160,789 .
  • EP-A-0467601 proposes methods for creating holographic diffraction grating patterns.
  • the method of mastering OVDs includes the steps of providing the LBR, introducing a substrate to the LBR, and exposing a portion of the substrate to the LBR.
  • the mastering system generally includes the LBR which has a laser that emits a beam.
  • the beam may be programmed or otherwise controlled ( e.g . without limitation, modulated) using a processor or computer, in order to expose the substrate and create the desired optical effect.
  • the exposure is then processed, typically by developing, to generate a master for the OVD.
  • the OVD can then be replicated in order to provide authentic resultant products or articles such as, for example, optical discs.
  • This subsequent processing may include, for example and without limitation, various electroforming steps to produce stampers, far example, in the form of nickel plates which can then be used for replication.
  • an optical image is designed using any known or suitable software program.
  • the image may incorporate any known or suitable optical effect (e.g ., without limitation, holograms, color effects, grating structures, 2D effects,3D effects, animation, and transformation effects).
  • Th software translates the optical image into linear data suitable for the LBR which then exposes the data on a substrate such as, for example, a photoresist plate, a phase transition material or a nitro-cellulose lacquer, in order to form the OVD.
  • the OVD may be simultaneously combined and/or interlaced with digital recorded data such as, for example, music or video data.
  • the photoresist plate is then developed and processed to produce a master from which authentic articles can be replicated.
  • authentic optical discs are injection molded to contain both the digital data and OVDs. Accordingly, a wide variety of products and articles can be authenticated in accordance with the invention by including any known or suitable optical effect or combination of optical effects.
  • an object of the invention to provide a system and method for authenticating articles, such as, for example and without limitation, optical discs, using a laser beam recorder (LBR) or an electron beam (e-beam) equivalent of the LBR, such as, for example, an e-beam recorder.
  • LBR laser beam recorder
  • e-beam electron beam
  • OTDs optically variable devices
  • optical effects and “diffractive effects,” refer to the variable visual characteristics, such as, for example and without limitation, change in color, rate of color change, change in shape and/or dimension, animation, transformation from one such effect to another, and combinations thereof, which are exhibited by the OVD and thus, are observed either by the naked eye or by machine when viewing the same from a predetermined angle.
  • fringes refers to any known or suitable arrangement, pattern, or structure which is generated to produce optical effects as defined herein, and expressly include “simple fringes,” such as, for example and without limitation, diffraction gratings, and “complex fringes,” such as, for example and without limitation, complex zone plates which include, for example, one or more diffractive lenses in order to provide three-dimensional (3D) optical effects and imagery ( e.g ., without limitation, animation).
  • simple fringes such as, for example and without limitation, diffraction gratings
  • complex fringes such as, for example and without limitation, complex zone plates which include, for example, one or more diffractive lenses in order to provide three-dimensional (3D) optical effects and imagery (e.g ., without limitation, animation).
  • the term "master,” refers to the fundamental structure or configuration of the OVD which is designed and created so as to resist counterfeiting. Accordingly, “mastering” refers to the process of generating the underlying particular OVD structure or optical effect thereof.
  • the master which is produced may comprise a single OVD element, which is either employed individually or mass reproduced, it may comprise a series or pattern multiple of OVD elements and/or a plurality of optical effects associated therewith, and it may further include a combination of digital data such as, for example, video or music data.
  • optical disc refers to any known or suitable readable data storage device which is typically, but not necessarily, generally circular in shape and expressly includes, but is not limited to, Compact Discs (CDs), Digital Versatile Discs (DVDs), Super Audio CDs (SACDs), Blu-ray Discs (BD), and High Definition Digital Versatile Discs (HD-DVDs).
  • CDs Compact Discs
  • DVDs Digital Versatile Discs
  • SACDs Super Audio CDs
  • BD Blu-ray Discs
  • HD-DVDs High Definition Digital Versatile Discs
  • the term "number,” shall mean one or more than one ( i.e ., a plurality).
  • FIGS 1 , 2 and 3 show the steps of a method for mastering OVDs, a method for authenticating optical discs, and an OVD mastering system 100 (shown in simplified form in Figure 3 ) for authenticating optical discs, respectively, in accordance with embodiments of the invention.
  • a laser beam recorder (LBR) 102 shown in simplified form in Figure 3
  • any known or suitable equivalent device for emitting a beam such as, for example, an e-beam recorder, could be employed. It will be appreciated that such devices, unlike known prior art recording devices which have multiple lasers with multiple wave fronts, typically employ a single laser having a single associated point of exposure.
  • a prepared substrate 206 coated with, for example, photoresist, a phase transition material or a nitro-cellulose lacquer is then introduced to the LBR 102.
  • a portion of the substrate 206 is then exposed to the beam 106 of the laser 104 in order to produce an exposure, in step 30.
  • the exposure is then developed in step 40 if necessary, and processed in step 50 to generate the master 202 ( Figure 4 ) for the OVD.
  • the invention employs the laser beam recorder (LBR) 102 to record, for example, both simple (e.g ., spiral 216 in Figure 4 ) and complex (e.g ., 3D image 220 in Figures 4 and 5 ) fringes, as defined herein, and thereby enables a wide variety of optical effects.
  • LBR laser beam recorder
  • the mastering system 100 (shown in simplified, schematic form) generally includes the LBR 102 having a laser 104, and rotation, focus and translation, and variable aperture systems 105,105'.
  • the laser 104 emits a beam that may be split into two beams 106 as required by the recording.
  • Several optical modulators and deflectors 108 are included for modulating the beam or beams 106 if the laser beam itself is not modulated, and a processor 110 is provided for controlling the laser 104, rotation, focus and translation, and variable aperture systems 105,105' and modulator and/or deflectors 108, as desired.
  • the system 100 may further include a computer 112, as shown in simplified form in the example of Figure 3 .
  • the computer 112 can be used to program the processor 110, and to generate any known or suitable diffractive effects 216 and/or images 218, as will be described herein. A more detailed description of the operation of the mastering system 100 follows.
  • the LBR 102 is used to record the binary data in the optical disc master substrate 206. This is done by focusing the beam 106 down to a fine spot (e.g ., without limitation, about 280 nanometers [nm] for DVD recording), which is modulated directly in the case of a solid state or diode laser or by using a modulator 108 in the case of a gas laser.
  • the modulator 108 may be, for example, an acousto-optical modulator (AO modulator) or an electro-optic modulator (EO modulator).
  • the modulator 108 chops ( i.e ., deflects, rotates the polarization, or modulates) the beam 106 to the appropriate desired lengths, suitable for a final binary code.
  • An exposure is produced which comprises, for example, a continuous chopped spiral 216 (shown greatly exaggerated and in simplified form in the example of Figure 4 , for simplicity of illustration) having gaps 208 ( i.e ., lands) between each spiral revolution 209.
  • the LBR 102 exposes onto a substrate 206 which typically, although not always, comprises a thin (e.g ., about 155 nm for a CD) coating of positive photoresist 206.
  • the photoresist 206 Before exposure, the photoresist 206, a phase transition material, a nitro-cellulose lacquer or the like, is preferably coated or sputtered onto a glass substrate or silicon wafer and the substrate 206 is exposed and subsequently developed, which removes the photoresist or phase transition material where the beam 106 (i.e., laser light) exposed the substrate 206.
  • substrate 206 In the case of photoresist or nitro-cellulose, which is developed, substrate 206 then has a conductive layer applied to it and, through subsequent electo-forming stages, an electroformed nickel stamper is made, which produces a mirror image duplicate of the original digital relief pattern (commonly referred to as the "pit" pattern), and is used to replicate the optical discs 200.
  • the substrate has a molded pit pattern or groove structure with the OVD in between, integrated into, or completely separate from a data pattern used in optical discs or recordable optical discs.
  • a metal or reflective layer 210 is on top of the pit pattern, and is covered by a separation layer 212. It is then bonded together with an identical substrate to complete the disc 200, as best shown in Figure 5 .
  • any known or suitable alternative layer combination and configuration other than the one illustrated in the examples of Figures 4 , 5 , and 6A-6D , could be employed.
  • the master 202 of the optical effects (e.g ., 216, 218, 220, 222, 224, 225, 226, 227, 228) produced in accordance with the disclosed method and system, can be applied directly to an article, such as the optical disc 200, or alternatively the master substrate 206 can be generated on a separate substrate as an original master relief pattern which is subsequently applied or transferred to any suitable molded or pressed article, such as, for example, stickers, wafers or tape.
  • a first step 12 an optical image (see, e.g ., image 226 being designed on computer 112 in the example of Figure 3 ) is designed. As will be discussed herein, this can be done using, for example, any known or suitable software program.
  • step 14 optical effects are added to the image design 226, as desired.
  • This information which generally comprises linear optical features, is then translated in step 16, to suitable layout data for use by the LBR 102 ( Figure 3 ). Simultaneously, data such as, for example, video and music data, is digitized 18 into digital data 22.
  • step 30' the LBR 102 exposes OVD fringe-like structures and digital data 22 into a photoresist plate 202.
  • the plate is then processed (e.g ., without limitation, developed for photoresist and phase transition materials) in step 40' and, if photoresist is used, a conductive layer is applied in step 42.
  • This can be followed by various known or suitable electroforming steps 50', in order to produce nickel stampers (not shown).
  • Authentic optical discs 200 ( Figures 4 and 5 ) are then injection molded from the nickel stampers, in step 52, with digital data 22 and OVDs.
  • Producing a controlled diffractive effect using the LBR 102 in accordance with embodiments of the invention involves controlling not only the modulation length (commonly referred to as the pit length), represented by the letter L in OVD 228 in the example of Figure 6D , but also the manner in which the tracks 209 are laid down in the spiral 216 relative to one another.
  • the modulation is preferably controlled radially ( e.g ., across the spiral 216 or generally perpendicularly with respect to the spiral 216), as well as tangentially ( e.g ., down the spiral 216).
  • the minimum length is about 400 nm, as limited by the diameter of the beam 106, and the pit width (i.e ., the exposure beam width) is about 280 nm.
  • the diffractive shape e.g ., 216, 218, 220, 222, 225, 226, 227, 228, at least two distinct areas of manipulation are required.
  • the length of the diffractive pit i.e ., exposed area
  • the minimum size of the diffractive pit element (i.e ., pit length) is approximately 280 nm.
  • the maximum length can be any suitable length necessary to provide the desired diffractive image. If an analog method is used, the steps can be infinite. Conversely, if a digital system is used, the steps should be as small as possible. It is, therefore, envisioned that steps as small as, or smaller than about 35 nm would be appropriate, although it will be appreciated that courser steps could be used, for example, to produce relatively simple diffraction gratings, without departing from the scope of the invention.
  • control is provided by building up multiple parallel or overlapping exposures (see, e.g ., the closely spaced oval gratings of OVD 224 in Figures 4 and 5 , which are greatly exaggerated and enlarged for simplicity of illustration, and the further gratings 225, 226, 227, 228 in the examples of Figures 6A, 6B, 6C and 6D , respectively), and by controlling the space between the exposure tracks 209.
  • overlapping the exposures e.g ., without limitation, establishing a very tight spiral
  • the potential for infinite control of the placement of the final diffractive pits is provided.
  • the pitch of a DVD is about 740 nm. Decreasing this by one-tenth and thereby providing a step or space between tracks of about 74 nm, should allow for most diffractive situations. It will, however, be appreciated that much courser or finer steps could be employed without departing from the scope of the invention. Such tangential and radial control allows for precise placement of the desired diffractive pits. It is, however, envisioned that a new encoder (i.e., processor 110) for the LBR 102, in conjunction with proprietary software for use by computer 112, could be developed to effectuate the principles of the invention as outlined herein.
  • extremely accurate and precise diffractive imagery can be produced in accordance with the disclosed system and method, by first creating a two dimensional micro layout (see, for example, bitmap image 226 on the screen of computer 112 in Figure 3 ) of the desired diffractive image. This can be accomplished, in step 12 previously discussed, using conventional XY coordinates. This diffractive image or element is subsequently remapped in step 16, preferably in a vector fashion, in both the tangential direction, and in the radial direction.
  • a practical example of this concept would be to produce a diffractive picture, made using any known or suitable bitmap program, such as, for example and without limitation, Adobe PhotoShop or Corel PhotoPaint.
  • the image such as, for example the star-shaped image 226 in the example of Figure 3
  • the image could be, for example, an 8-bit graphic having 256 tones or colors, wherein each of the tones or colors is represented in a look-up table (e.g ., palette), and each of the 256 different elements could represent a different diffractive angle.
  • a look-up table e.g ., palette
  • each of the 256 different elements could represent a different diffractive angle.
  • one or more elements of the palette can be saved for pure exposure only, as opposed to the fringes (e.g ., line-pairs) used to produce a grating. This would be particularly useful when paired with data for producing watermarks, for example, as will be discussed hereinbelow. Accordingly, it will be appreciated that any suitable number and configuration of angles can be employed in accordance with embodiments of
  • step 14 other look-up tables can be used alternatively or additionally in order to apply a wide variety of different known or suitable optical effects and techniques, thereby allowing for a rich range of optical effects.
  • four different optical effects are shown, a relatively simple spiral diffractive grating 216, a more complex oval-shaped OVD 224, a three-dimensional (3D) star 220 generated in accordance with the process being described, and a two-dimensional (2D) moon-shaped diffractive image 222 (shown in Figure 5 in phantom line drawing).
  • the exemplary star 220 is animated and morphs or transforms into the moon 222, when viewed from a predetermined angle as will be described herein.
  • every pixel in the original bitmap imagery (e.g ., star bitmap 226 in Figure 3 ) will translate to a holographic pixel (which can be referred to as a hoxel).
  • a holographic pixel (which can be referred to as a hoxel).
  • These hoxels can be a different diffractive images, which may be anything from simple linear gratings to more complex zone plates, or the like.
  • the zone plate can be, for example and without limitation, a simple diffractive lens, or a complex lens, such as a lens that has different spatial frequencies in the "x" direction and the "y" direction.
  • the hoxel can be an individual grating element (i . e ., pixel) of a size not normally visible to the human eye, although it will be appreciated that in other embodiments of the invention, special effects of the hoxel are visible.
  • large diffractive lenses i.e ., lenses which are easy seen by the human eye
  • Such lenses could have the effect of, for example, a diffractive fresnel lens or any other known or suitable lens, such as, for example and without limitation, an Axicon lens.
  • many hoxels can be combined together in order to produce the final optical picture or effect.
  • the star-shaped diffractive image 220 could be provided with an optical effect of appearing to twinkle when viewed from predetermined angles.
  • zone plates e.g ., without limitation, diffractive lenses
  • the production of zone plates allows for the building of three-dimensional (3D) shapes, such as star 220.
  • two-dimensional (2D) holography, three-dimensional (3D) holography, stereo-pairs, which would allow for simple 3D imagery, and stereograms, which will allow movement in the imagery are all contemplated by embodiments of the invention.
  • Images and effects can also be produced from vector programs such as, for example, and without limitation, Adobe Illustrator or Corel Draw. Pure vector files can either be used on their own to produce precise shapes, or in combinations with bitmap programs to give unique effects.
  • vector programs such as, for example, and without limitation, Adobe Illustrator or Corel Draw.
  • Pure vector files can either be used on their own to produce precise shapes, or in combinations with bitmap programs to give unique effects.
  • the advantage of vector programs is that they work with mathematic coordinates, as opposed to a raster grid, thereby giving a smoother end result.
  • the spatial frequency of the different hoxels needs to be carefully altered to play back natural colors at a predetermined viewing angle. In this manner; simple calculations allow for full color to be had at a wide range of different viewing angles. More specifically, to produce a desired color changing effect (e.g ., without limitation, going from one color to another) that is viewed by rotating the disc or other suitable article which has been authenticated in accordance with the invention, different spatial frequencies in the "x" and "y" directions are employed. Moreover, an even further color change feature could be optionally provided by employing oval-shaped gratings, such as those shown in profile 227 in Figure 6C and the oval-shaped OVD 224 of Figures 4 and 5 .
  • a diffractive image can be made from an 8- bit grayscale file with the grays representing different dif&active angles, as previously discussed.
  • black represents the zero tone value in the look-up table wherein there is no exposure, and the other 255 tonal values represent evenly spaced different angles of diffraction.
  • the spatial frequency of the grating which is defined by the distance between one exposed width and one unexposed width (i.e ., a pair of grooves or lines 209), is on the order of one micrometer (micron), although it will be appreciated that in other embodiments of the invention, the width could be any suitable value from greater than 5 microns to about 105 nm.
  • a full color diffractive picture could be produced by starting with a full color bit-map picture and then separating the color using any known or suitable bit-map software program such as, for example and without limitation, Adobe Photo Shop or Corel Photo-Paint.
  • the star diffractive image 220 would originate as a full color bitmap image 226 generated on the computer 112, as shown in Figure 3 .
  • the resulting grayscale separations would then be used to map onto grids of red, blue, and green hoxels.
  • the hoxels are arranged in any number of suitable different orientations, with each element preferably being smaller then the human eye can perceive.
  • the foregoing combination of OVDs could, for example, provide the appearance of the visible surface of the optical disc 200 turning from twilight (i.e., a relatively light gray) to nighttime (i.e., a darker gray or black), and the star 220 could be yellow and change into a shining white moon 222.
  • twilight i.e., a relatively light gray
  • nighttime i.e., a darker gray or black
  • the star 220 could be yellow and change into a shining white moon 222.
  • full color diffractive images can be produced by breaking a full color photograph into small hoxel elements and then mapping each element to a look-up table containing the whole spectrum. This process is controlled by altering the spatial frequency of the hoxels. To produce certain colors which are outside of the spectrum, it will be necessary to break the hoxels into smaller elements to allow two or more spectral colors to be combined and thereby provide the final desired color. It will be appreciated that other color regimes are quite practical, such as, for example, dynamic color zones, which allow the color of individual color elements making up the final color image to dynamically alter ( e.g ., change spatial frequency) within the same element space, thereby allowing for bright imagery.
  • an Aztec hologram could be created using the exemplary method of mastering OVDs in accordance with the invention.
  • Aztec holograms give the potential for full color, stable imagery.
  • a complex step grating would be exposed in step 30 and 30'.
  • the resolution requirement would go up considerably. It is contemplated that the LBR system 100 would, therefore, need to have a resolution of at least about 150 nm, or more.
  • a stereogram can be made from a number of 2D images. Stereograms are often used to make a stereo 3D image which can be, although it is not required to be, animated, such as the exemplary star stereogram 220 in the example of Figures 4 and 5 . Such stereograms can also be full color at a predetermined viewing angle. Moreover, stereograms can also be used to animate 2D images, such as the moon-shaped image 222 in Figure 5 . Such stereograms can be calculated using the principles for two-dimensional diffuse holography and can be based on a number of overlapping two-dimensional images, although it will be appreciated that any other known or suitable variation which can be utilized without requiring diffuse imagery, could also be employed.
  • these images could be first produced on the computer 112 using any known or suitable 3D animation program, such as, for example and without limitation, Autodesk 3ds Max.
  • 3D animation program such as, for example and without limitation, Autodesk 3ds Max.
  • Such programs give the ability to generate ( e.g., without limitation, sculpt) a 3D model, as opposed to the 2D star model 226 shown on the screen of computer 112 in the example of Figure 3 .
  • the model may, therefore, move ( i.e., animate) in many different ways, including morphing or transforming into an entirely different shape, like the exemplary 3D star 220 which morphs into the 2D moon 222, in the example of Figure 5 .
  • conventional video or film footage may be used to produce the stereograms.
  • the disclosed method and system of mastering OVDs are capable of providing an essentially limitless variety of colors, shapes, dimensions, movements ( e.g ., without limitation, animations), and/or any other known or suitable optical effects, and combinations thereof. Such effects may be grey scale, or full color, as previously discussed. It will still further be appreciated that the disclosed color control and animation capabilities provide the ability to make animated movie OVDs. This could be accomplished, for example, by interlacing many frames, or off-setting the frames from each other using slightly different reference angles.
  • the stereogram could morph into an entirely different effect, such as, for example and without limitation, a simple grating, or text, a symbol, or a message for example, could appear at a predetermined viewing angle.
  • the disclosed system and method provide a vast improvement over known conventional OVD methods and systems, which do not easily allow seamless blending of different optical effects, and techniques for generating the same.
  • any known or suitable optical technique or effect can be produced, and can be morphed ( e.g ., changed or dissolved) into any other known or suitable optical technique or effect or combination thereof, thereby providing essentially seamless transformations among combinations of optical effects.
  • an optical disc 200 or other suitable product which has been authenticated in accordance with the disclosed OVD mastering method and system 100, can have a first optical effect (e.g ., without limitation, an animated 3D picture such as 3D animated star 220), which is capable of smoothly changing or transforming ( i.e., transitioning) into one or more other ( i.e., different) optical effects (e.g ., without limitation, another animated 2D or 3D image, or an unanimated image or effect, such as the unanimated 2D moon 222 of Figure 5 ).
  • a first optical effect e.g ., without limitation, an animated 3D picture such as 3D animated star 220
  • another animated 2D or 3D image e.g ., without limitation, another animated 2D or 3D image, or an unanimated image or effect, such as the unanimated 2D moon 222 of Figure 5 .
  • optical black effects may be provided.
  • Optical black effects have the effect of capturing light, in order to give a dark look with a bright blue or blue/green grating. This optical effect is typically seen at an oblique angle (i.e ., an angle which is neither perpendicular nor parallel with respect to the plane of the optical disc), and is achieved by having very fine spatial frequencies and a high aspect ratio between the spatial frequencies. In other words, the depth is much greater than the spatial frequency.
  • a still further variation is produced by having a cross-hatch grating (not shown), which provides an optical effect commonly referred to as a "moth eye” effect (not shown).
  • the disclosed OVD mastering system 100 and associated method can also provide Inner Mirror Band (IMB) imagery, outer Mirror Band (OMB) imagery, and any suitable combination of IMB and OMB imagery.
  • IMB imagery is an optical effect that is disposed on the inside of the data (e.g ., the digital data recorded on the optical disc), whereas OMB imagery is an optical effect anywhere outside of the data area.
  • Mid band OVD effects are also possible whereby there is a break in the data and an OVD is inserted, although special mastering would be required to allow optical readers to "jump over" the break in the data.
  • the method of the invention can also interlace OVDs with the data (e.g ., without limitation, running a parallel track with the data) either throughout an entire data recording or at one or more predetermined areas of the data recording (see, e.g ., track pattern 228 in the example of Figure 6D ).
  • Such interlacing with the data provides a very effective watermark effect, thereby further resisting counterfeiting.
  • This system would be particularly suitable for injection molding the optical imagery into optical discs 200 as one layer among multiple layers of the disc 200, such as, for example and without limitation, a layer 206 in a DVD9 disc 200 such as the one shown in the example of Figure 4 .
  • a DVD9 disc has a single-sided, dual-layer data construction, as shown in Figure 4 .
  • any other known or suitable optical disc expressly including but not limited to, a DVD 10 (single-layer, dual-side), a DVD14 (a dual-side, one single layer and one dual-layer component), a DVD18 (dual-sided dual-layer), and the like.
  • Masters can also be produced in accordance with embodiments of the invention, for a so-called edge-to-edge layer on an optical disc. This is achieved by adding a lacquer layer, such as layer 214, for embossing as discussed, for example, in U.S. Patent No. 6,160,789 to N.C. Abraham .
  • an IMB OVD utilizing any of the aforementioned techniques, or any other known or suitable optical technique, can be produced and combined with only data (i.e., digital music or video data and no OVD) which, for example, continues until a predetermined location near the middle of the disc where the track pitch is then altered ( e.g ., increased), and a parallel OVD track is introduced for a predetermined interval. The parallel OVD track is then stopped, and the data goes back to its original track pitch. In this manner, an OVD watermark effect can be produced in the center of the disc.
  • data i.e., digital music or video data and no OVD
  • Embodiments of the invention further provide the potential to produce continuous grating streams which may or may not be courser than the digital data pits being made on the optical disc.
  • This allows for the customization of each individual disc using, for example, a laser to cut or etch small amounts of digital data by eradicating grating elements and producing a binary stream.
  • More complex grating structures such as, for example a blazed grating (commonly referred to as a saw-tooth), could also be produced.
  • a saw-tooth grating can be extremely efficient at predetermined wavelengths.
  • an important consideration when dealing with more complex relief profiles is the thickness of photoresist or other suitable medium used to record the data pits and OVD.
  • the thickness of the photoresist generally needs to be much greater than the thickness of known conventional photoresists used for optical discs.
  • CD resist coatings are generally about 130 nm thick
  • DVD coatings are about 110 nm thick
  • HD-DVD coatings are about 67 nm thick.
  • resist coating thicknesses often have resist coating thicknesses of about 1 micron to about 1.5 microns (about 1,000 nm to about 1,500 nm), and the fringe depths are often only about 0.3 microns to about 0.5 microns but, additional resist allows for greater exposure latitude.
  • Relatively simple gratings have a much greater diffraction efficiency if the coatings are thicker than is usual for known conventional optical discs. Moreover, for some techniques such as, for example, the aforementioned blazed gratings, optical black imagery, and Aztec imagery, such thicker coatings are almost always essential. Hence, it will be appreciated that there are typically limitations on what techniques can be suitably employed in conjunction with data. However, when the plates are used for injection molding (see, for example, step 52, previously discussed), casting or embossing as a separate layer in an optical disc, or when masters are being made for other forms of duplication, such limitations generally do not exist.
  • Another possibility presented by the invention is to alter the thickness of the photoresist across the master in order to give one thickness of resist for the digital data, and another for the OVD.
  • Any known or suitable method could be used to control the thickness, such as, for example and without limitation, selectively exposing the area of the resist via contact copying with a mask ( i.e., with blue or UV light), projecting the mask, or using the LBR 102 to expose the resist so that when initially developed, it removes sufficient resist so as to give the desired thickness for recording data.
  • the OVD and the digital data can be separately exposed, and subsequently recombined using casting or any other known or suitable technique.
  • the disclosed system 100 and method are adapted to provide variable exposure wherein any of a number of parameters such as, for example, focus of the beam 106, frequency, modulation intensity, beam shape and beam deflection, can be controlled ( e.g ., varied) as desired to achieve the desired optical effect.
  • photoresist is, in some cases, not necessary for mastering of the data pits.
  • known polymer and phase change systems used for Blu-Ray, and occasionally for CD and DVD mastering allow the recording of data pits and, therefore, could be used in conjunction with the system 100 and associated method of the invention to master the OVDs.
  • embodiments of the invention provide a very powerful OVD mastering system 100 and method which may be used to make masters that can be employed in any application where masters made by known conventional holographic relief techniques or electronic beam (commonly referred to as "e-beam") originations are typically employed, and in any other known or suitable location.
  • OVDs in accordance with embodiments of the invention can be duplicated, if desired, using known conventional embossing, casting or injection molding systems.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Manufacturing & Machinery (AREA)
  • Optical Recording Or Reproduction (AREA)
  • Manufacturing Optical Record Carriers (AREA)
  • Diffracting Gratings Or Hologram Optical Elements (AREA)
  • Holo Graphy (AREA)
EP07756494A 2006-01-30 2007-01-29 Optically variable device mastering system, method of authenticating articles employing the same, and resultant article Active EP1979786B1 (en)

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ATE532098T1 (de) 2011-11-15
CA2637944A1 (en) 2007-10-11
WO2007114976A3 (en) 2008-04-03
EP1979786A4 (en) 2009-12-16
CN101421667A (zh) 2009-04-29
EP1979786A2 (en) 2008-10-15
CA2637944C (en) 2015-04-21
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US8921011B2 (en) 2014-12-30
US20130234364A1 (en) 2013-09-12

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